如何让一个COM接口返回DOUBLE型指针

Question

如何让一个COM接口返回DOUBLE型指针

Answer 1

接口函数中定义一个double**类型的out参数

Answer 2

HRESULT Proc7(
     [out] long  * pSize,
     [out, size_is( , *pSize)] double ** ppMyType); 

Answer 3

HRESULT Proc1(
    [in] short m;
    [in, size_is(m)] short a[]);  // If m = 10, a[10]
HRESULT Proc2(
    [in] short m;
    [in, size_is(m)] short b[][20]);  // If m = 10, b[10][20]
HRESULT Proc3(
    [in] short m;
    [size_is(m)] short * pshort); /* Specifies a pointer
                                  to an m-sized block of shorts */
HRESULT Proc4(
    [in] short m;
    [size_is( , m)] short ** ppshort); /* Specifies a pointer 
                                       to a pointer to an m-sized 
                                       block of shorts */
HRESULT Proc5(
    [in] short m;
    [size_is(m ,)] short ** ppshort); /* Specifies an
                                      m-sized block of pointers 
                                      to shorts */
HRESULT Proc6(
    [in] short m;
    [in] short n;
    [size_is(m,n)] short ** ppshort); /* Specifies a pointer to an 
                                      m-sized block of pointers, each 
                                      of which points to an n-sized 
                                      block of shorts.*/
 HRESULT Proc7(
     [out] long  * pSize,
     [out, size_is( , *pSize)] my_type ** ppMyType); /* Specifies a pointer 
                                              to a sized pointer, 
                                              which points to a block 
                                              of my_types, whose size is
                                              unknown when the stub 
                                              calls the server. */

Answer 4

double* p;是你要返回的指针，接口函数调用中YourInterface->SomeMethod(...,&p);就可以了